I just saw that New York Times has an article that reveals what is the mysterious piece of hardware Valve is working on. It turns out to be a Virtual & Augmented Reality Goggles system.
The article states that Valve is generally looking on improving and making Wearable Computing a mainstream to be used in future PC games.

I find this new piece of tech and thought to be exciting,but I doubt if game developers will spend time utilizing such 'exotic' tech as this goggles system,seeing how there is already very small support for innovative systems when it comes for games for PCs,judging by the utilization of other clever accessories like Razer's Sixense.

The truth is most developers are already too bored to even make a PC specific GUI,or provide proper mouse and keyboard support for their most games which are ported from consoles.
But who knows ? Perhaps things can change in the future.
But what I get is that the next generation of platforms will heavily depend on new ways to play games,than just improvement of visuals.